Mechanical resonance type frequency meter is principally an electro mechanical device.
Electrical resonance type frequency meter.
It mainly consists of a fixed coil and a moving coil.
Frequency meter device for measuring the repetitions per unit of time customarily a second of a complete electromagnetic waveform various types of frequency meters are used.
Changes in the frequency to be measured cause a change.
Electrical resonance frequency meter is very simple instrument of indicating type.
In this article we will study about ferrodynamic type frequency meter.
Fixed coil fixed coil is divided into two parts 1 and 2 which forms two separates resonant circuits fixed coil 1 is in series with an inductance l1 and a capacitance c1 forming a resonant circuit of frequency f1.
The electrical resonance type frequency meter is an indicating type instrument.
This instrument operates on the principle of electrical resonance i e.
Also we call this instrument the vibrating reed type frequency meter.
The vibrating reed type frequency meters or mechanical resonance type frequency meter indicate the supply frequency of the circuit directly and are very much convenient for most practical purposes.
The vibrating reed frequency meter is a very simple instrument and has got an advantage of giving reading free from errors due to change in temperature waveform and magnitude of applied voltage.
As the name suggests its action depends upon the electrical resonance.
Construction of weston frequency is as compared.
There is a laminated iron core of varying cross section.
Conceptually the principal of this frequency meter is quite simple.
Construction of electrical resonance type frequency meter.
The instrument consists of a number of metal reeds with slightly different natural frequencies fitted side by side.
When inductive reactance xl and capacitive reactance xc become equal electrical resonance is said to have occurred.
Various types of frequency meters are used.
The operation of a resonant type frequency meter is based on the comparison of the frequency being measured with the frequency of natural oscillations in an electrical circuit or a microwave resonator that is tuned to resonance with the frequency being measured.
The main principle of working of weston type frequency meter is that when an current flows through the two coils which are perpendicular to each other due to these currents some magnetic fields will produce and thus the magnetic needle will deflects towards the stronger magnetic field showing the measurement of frequency on the meter.
Great sensitivity ii electrodynamometer type of frequency meter.
These operate by balancing two opposing forces.
Many are instruments of the deflection type ordinarily used for measuring low frequencies but capable of being used for frequencies as high as 900 hz these operate by balancing two opposing forces.
